Why doesn't KD win?

Charles Barkley once famously said that Kevin Durant could never win a championship as a "Bus Driver."

And this current season feels like testament to that - He's still highly efficient, 52/41/83 (64TS), but the Suns are struggling to find a play-in spot.

Comparing Lebron, Steph, and KD, Durant doesn't seem to move the W column that much.

The '16 Thunder had 55 wins with KD, and the '17 Thunder had 47 wins without him. Meanwhile, '10 Cavs with LeBron had 61 wins and then 19 wins that following year without him.

And then Steph had his injury year which made the Warriors a lottery team, although a lot of others were injured too, but KD doesn't seem anywhere close to being a player that adds to the win columns like the other two.

Which is perplexing because he is consistently added to All-Time starting 5 lists. Arguably the greatest scorer ever, the most efficient scorer ever, so then what is it about his game that isn't able to translate to Wins?

Can he not just brute force a win, taking 30+ FGAs a game like Kobe or Jordan did on a consistent basis? Is fatigue an issue? He's doesn't necessarily contain the athletic build to sustain high energy possessions for 35+ minutes a night, could that be it?

Is it true that KD could never have a championship ring if he is option 1?